<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>demo04-change-proto</title>
</head>
<script>

    let obj1 = {};
    obj1.username = 'aa'
    obj1.age = 18
    // obj1.prototype.arr11=[1,2,3]

    console.log(obj1);  

    obj1 = {uhname : 'hhhddddd' , age : 99}


    console.log(obj1);  
    console.log(obj1.prototype);
    console.log(obj1.__proto__);  
    console.log(obj1.__proto__ == Object);  
    console.log(obj1.__proto__ == Object.prototype);  

</script>
<body>
    
</body>
</html>